Moving object detection device using ultrasonic sensor, method thereof, and warning system using the same

1. A moving object detection device comprising:

an ultrasonic sensor configured to receive a plurality of reflected signals per period; and

a detector configured to:

divide a sensing distance of the ultrasonic sensor into a plurality of regions;

when an intensity of a reflected signal of the plurality of reflected signals exceeds a predetermined threshold in a region of the plurality of regions, detect the region of the plurality of regions as a region of interest (ROI); and

when a ROI of a first reflected signal of the plurality of reflected signals does not correspond to a ROI of any subsequent reflected signals of the plurality of reflected signals, determine an object in the ROI of the first reflected signal as a moving object.

2. The device according to claim 1 , wherein the detector is configured to:

when the ROI of the first reflected signal is a first region of the plurality of regions, determine whether any one of the first region, a second region, or a third region of the plurality of regions corresponds to a ROI of a second reflected signal, wherein the second region and the third region are adjacent to the first region;

when the second region is determined as the ROI of the second reflected signal, determine whether any one of the second region, the first region, or a fourth region of the plurality of regions corresponds to a ROI of a third reflected signal, wherein the second region and the fourth region are adjacent to the second region; and

when the ROI of any of the reflected signals is not determined, determine an object in the first region of the first reflected signal is a moving object.

3. The device according to claim 1 , wherein the detector is configured to:

compare the intensity of any reflected signal of the plurality of reflected signals excluding the first reflected signal with the predetermined threshold, wherein hysteresis is applied to the predetermined threshold; and

detect the ROI.

4. The device according to claim 1 , further comprising:

a storage configured to store the ROI of any reflected signal of the plurality of reflected signals.

5. A method for detecting a moving object using an ultrasonic sensor, the method comprising:

receiving, with the ultrasonic sensor, a plurality of reflected signals per period;

dividing, with a detector, a sensing distance of the ultrasonic sensor into a plurality of regions;

when an intensity of a reflected signal of the plurality of reflected signals exceeds a predetermined threshold in a region of the plurality of regions, detecting, with the detector, the region of the plurality of regions as a region of interest (ROI); and

determining, with the detector, an object in a ROI of a first reflected signal as a moving object when a ROI of the first reflected signal of the plurality of reflecting signals does not correspond to a ROI of any subsequent reflected signals of the plurality of reflected signals.

6. The method according to claim 5 , wherein detecting the moving object comprises:

when the ROI of the first reflected signal is a first region of the plurality of regions, determining whether any one of the first region, a second region, or a third region of the plurality of regions corresponds to a ROI of a second reflected signal, wherein the second region and the third reason are adjacent to the first region;

when the second region is determined as the ROI of the second reflected signal, determining whether any one of the second region, the first region, or a fourth region of the plurality of regions corresponds to a ROI of a third reflected signal, wherein the second region and the fourth region are adjacent to the second region; and

when the ROI of any of the reflected signals is not determined, determining an object in the first region of the first reflected signal is a moving object.

7. The method according to claim 5 , wherein detecting the moving object comprises:

comparing the intensity of any reflected signal of the plurality of reflected signals excluding the first reflected signal with the predetermined threshold, wherein hysteresis is applied to the predetermined threshold; and detecting the ROI.

8. The method according to claim 5 , further comprising: storing the ROI of any reflected signal of the plurality of reflected signals.